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US 5,037,277 AGranted
Poppet valve for a high pressure fluid pump
AssigneeFlow International Corporation
InventorDavid K. M. Tan
Life of this patent
Estimating the term…
Abstract
An outlet valve for a high pressure pump which is designed to alleviate "sticking" of the moveable valve element. An annular recess is formed at a transitional flow area where high pressure fluid flows forwardly and then radially outwardly between contact surfaces of the valve element and a valve seat member. It is believed this alleviates a problem of separated flow at the transition area which would effectively decrease the flow area and cause a localized pressure reduction which would delay proper opening of the valve element. Also, other configurations are shown for tripping the boundary layer to avoid separation, and other configurations to alleviate the same.
Claims35
A very high pressure liquid pump arranged to alleviate delayed outlet valve opening in a manner to prevent pressure spikes at initiation of an outflow portion of a pumping cycle, said pump comprising:
- a. a structure defining a liquid chamber to receive liquid which is to be pumped;
- b. piston means arranged to pump liquid from said chamber at a very high pressure;
- c. an outlet valve comprising:
- i. a valve seat member having:
- 1. a passageway defining surface which defines a valve passageway having a forward outlet end portion;
- 2. a valve seat contact surface which extends radially outwardly from the outlet end portion of the valve passageway;
- ii. a valve element having a valve element contact surface, said valve element being movable between a closed position where said valve element contact surface bears against said valve seat contact surface to close said valve passageway and an open position where said valve element contact surface is spaced from said valve seat contact surface to define therebetween a radially outwardly extending passageway region to receive flow from said valve passageway;
- iii. said passageway defining surface meeting said valve seat contact surface at a transition region where flow from said valve passageway flows into said radially outwardly extending passageway region, said valve seat member having a recess surface portion which defines at said transition region an annular recess having a radially inward rear edge portion, a radially outward forward edge portion, and an intermediate surface portion, said rear edge portion and said forward edge portion defining end limits of a transitional fluid flow surface region, said intermediate surface portion defining an annular fluid recess spaced radially outwardly of said transitional fluid flow surface region,
- whereby as said piston means begins a discharge stroke, so as to move said valve element away from said valve seat member potential pressure reduction adjacent to said transition region is substantially alleviated to permit said valve element to move to a fully open position without creating any substantial pressure spike in said chamber.
6 more elements
A very high pressure liquid pump arranged to alleviate delayed outlet valve opening in a manner to prevent pressure spikes at initiation of an outflow portion of a pumping cycle, said pump comprising:
- a. a structure defining a liquid chamber to receive liquid which is to be pumped;
- b. piston means arranged to pump liquid from said chamber at a very high pressure;
- c. an outlet valve comprising:
- i. a valve seat member having:
- 1. a passageway defining surface which defines a valve passageway having a forward outlet end portion;
- 2. a valve seat contact surface which extends radially outwardly from the outlet end portion of the valve passageway;
- ii. a valve element having a valve element contact surface, said valve element being movable between a closed position where said valve element contact surface bears against said valve seat contact surface to close said valve passageway and an open position where said valve element contact surface is spaced from said valve seat contact surface to define therebetween a radially outwardly extending passageway region to receive flow from said valve passageway;
- iii. said passageway defining surface meeting said valve seat contact surface at a transition region where flow from said valve passageway flows into said radially outwardly extending passageway region, said valve having boundary layer tripping means positioned at a location of flow into said transition region and arranged to trip boundary layer flow of fluid flowing along said passageway defining surface;
- whereby as said piston means begins a discharge stroke, so as to move said valve element away from said valve seat member potential pressure reduction adjacent to said transition region is substantially alleviated to permit said valve element to move to a fully open position without creating any substantial pressure spike in said chamber.
6 more elements
A very high pressure liquid pump arranged to alleviate delayed outlet valve opening in a manner to prevent pressure spikes at initiation of an outflow portion of a pumping cycle, said pump comprising:
- a. a structure defining a liquid chamber to receive liquid which is to be pumped;
- b. piston means arranged to pump liquid from said chamber at a very high pressure;
- c. an outlet valve comprising:
- i. a valve seat member having:
- 1. a passageway defining surface which defines a valve passageway having a forward outlet end portion;
- 2. a valve seat contact surface which extends radially outwardly from the outlet end portion of the valve passageway;
- ii. a valve element having a valve element contact surface, said valve element being movable between a closed position where said element contact surface bears against said valve seat contact surface to close said valve passageway and an open position where said valve element contact surface is spaced from said valve seat contact surface to define therebetween a radially outwardly extending passageway region to receive flow from said valve passageway;
- iii. said passageway defining surface meeting said valve seat contact surface at a transition region where flow from said valve passageway flows into said radially outwardly extending passageway region, said valve seat member having a transition surface portion at said transition region which in circumferential cross-sectional configuration is convexly curved in a continuous curve to cause boundary layer flow along said transition surface in a continuous curved path from said valve passageway to said radially outwardly extending passageway region;
- whereby as said piston means begins a discharge stroke, so as to move said valve element away from said valve seat member potential pressure reduction adjacent to said transition region is substantially alleviated to permit said valve element to move to a fully open position without creating any substantial pressure spike in said chamber.
6 more elements
A very high pressure liquid pump arranged to alleviate delayed outlet valve opening in a manner to prevent pressure spikes at initiation of an outflow portion of a pumping cycle, said pump comprising:
- a. a structure defining a liquid chamber to receive liquid which is to be pumped;
- b. piston means arranged to pump liquid from said chamber at a very high pressure;
- c. an outlet valve comprising:
- i. a valve seat member having:
- 1. a passageway defining surface which defines a valve passageway having a forward outlet end portion;
- 2. a valve seat contact surface which extends radially outwardly from the outlet end portion of the valve passageway;
- ii. a valve element having a valve element contact surface, said valve element being movable between a closed position where said valve element contact surface bears against said valve seat contact surface to close said valve passageway and an open position where said valve element contact surface is spaced from said valve seat contact surface to define therebetween a radially outwardly extending passageway region to receive flow from said valve passageway;
- iii. said passageway defining surface meeting said valve seat contact surface at a transition region where flow from said valve passageway flows into said radially outwardly extending passageway region, said valve seat member and said valve element defining at said transition region an annular expanded passageway region radially outwardly of said forward outlet end portion and radially inwardly of said valve seat contact surface and of said valve element contact surface,
- whereby as said piston means begins a discharge stroke, so as to move said valve element away from said valve seat member potential pressure reduction adjacent to said transition region is substantially alleviated to permit said valve element to move to a fully open position without creating any substantial pressure spike in said chamber.
6 more elements
A very high pressure liquid pump arranged to alleviate delayed outlet valve opening in a manner to prevent pressure spikes at initiation of an outflow portion of a pumping cycle, said pump comprising:
- a. a structure defining a liquid chamber to receive liquid which is to be pumped;
- b. piston means arranged to pump liquid from said chamber at a very high pressure;
- an improvement comprising an outlet valve comprising:
- a. a valve seat member having:
- i. a passageway defining surface which defines a valve passageway having a forward outlet end portion;
- ii. a valve seat contact surface which extends radially outwardly from the outlet end portion of the valve passageway;
- b. a valve element having a valve element contact surface, said valve element being movable between a closed position where said valve element contact surface bears against said valve seat contact surface to close said valve passageway and an open position where said valve element contact surface is spaced from said valve seat contact surface to define therebetween a radially outwardly extending passageway region to receive flow from said valve passageway;
- c. said passageway defining surface meeting said valve seat contact surface at a transition region where flow from said valve passageway flows into said radially outwardly extending passageway region, said valve seat member having a recess surface portion which defines at said transition region an annular recess having a radially inward rear edge portion, a radially outward forward edge portion, and an intermediate surface portion, said rear edge portion and said forward edge portion defining end limits of a transitional fluid flow surface region, said intermediate surface portion defining an annular fluid recess spaced radially outwardly of said transitional fluid flow surface region,
- whereby as said piston means begins a discharge stroke, so as to move said valve element away from said valve seat member potential pressure reduction adjacent to said transition region is substantially alleviated to permit said valve element to move to a fully open position without creating any substantial pressure spike in said chamber.
6 more elements
In a very high pressure liquid pump arranged to alleviate delayed outlet valve opening in a manner to prevent pressure spikes at initiation of an outflow portion of a pumping cycle, said pump comprising:
- a. a structure defining a liquid chamber to receive liquid which is to be pumped;
- b. piston means arranged to pump liquid from said chamber at a very high pressure;
- an improvement comprising an outlet valve comprising:
- a. a valve seat member having:
- i. a passageway defining surface which defines a valve passageway having a forward outlet end portion;
- ii. a valve seat contact surface which extends radially outwardly from the outlet end portion of the valve passageway;
- b. a valve element having a valve element contact surface, said valve element being movable between a closed position where said element contact surface bears against said valve seat contact surface to close said valve passageway and an open position where said valve element contact surface is spaced from said valve seat contact surface to define therebetween a radially outwardly extending passageway region to receive flow from said valve passageway;
- c. said passageway defining surface meeting said valve seat contact surface at a transition region where flow from said valve passageway flows into said radially outwardly extending passageway region, said valve having boundary layer tripping means positioned at a location of flow into said transition region and arranged to trip boundary layer flow of fluid flowing along said passageway defining surface;
- whereby as said piston means begins a discharge stroke, so as to move said valve element away from said valve seat member potential pressure reduction adjacent to said transition region is substantially alleviated to permit said valve element to move to a fully open position without creating any substantial pressure spike in said chamber.
6 more elements
In a very high pressure liquid pump arranged to alleviate delayed outlet valve opening in a manner to prevent pressure spikes at initiation of an outflow portion of a pumping cycle, said pump comprising:
- a. a structure defining a liquid chamber to receive liquid which is to be pumped;
- b. piston means arranged to pump liquid from said chamber at a very high pressure;
- an improvement comprising an outlet valve comprising:
- a. a valve seat member having:
- i. a passageway defining surface which defines a valve passageway having a forward outlet end portion;
- ii. a valve seat contact surface which extends radially outwardly from the outlet end portion of the valve passageway;
- b. a valve element having a valve element contact surface, said valve element being movable between a closed position where said element contact surface bears against said valve seat contact surface to close said valve passageway and an open position where said valve element contact surface is spaced from said valve seat contact surface to define therebetween a radially outwardly extending passageway region to receive flow from said valve passageway;
- c. said passageway defining surface meeting said valve seat contact surface at a transition region where flow from said valve passageway flows into said radially outwardly extending passageway region, said valve seat member having a transition surface portion at said transition region which in circumferential cross-sectional configuration is convexly curved in a continuous curve to cause boundary layer flow along said transition surface in a continuous curved path from said valve passageway to said radially outwardly extending passageway region;
- whereby as said piston means begins a discharge stroke, so as to move said valve element away from said valve seat member potential pressure reduction adjacent to said transition region is substantially alleviated to permit said valve element to move to a fully open position without creating any substantial pressure spike in said chamber.
6 more elements
Dependencies are inferred from the claim text.